/Engine/Source/Runtime/AudioExtensions/Public/ISoundfieldEndpoint.h
For endpoints that override EndpointRequiresCallback to return true, this callback will be called every (GetDesiredNumFrames() / GetSampleRate()) seconds.
virtual void OnAudioCallback ( [TUniquePtr](API\Runtime\Core\Templates\TUniquePtr)< [ISoundfieldAudioPacket](API\Runtime\AudioExtensions\ISoundfieldAudioPacket) > && InPacket, const [ISoundfieldEndpointSettingsProxy](API\Runtime\AudioExtensions\ISoundfieldEndpointSettingsProxy) * InSettings )